1. 1) F. Arago, p. 149; reprinted in “OEuvres Complètes de François Arago”, Vol. 8, Gide & Weigel, Paris and Leipzig (1858) p. 87.
2. 5) Y. Fujioka, Nippon Steel Tech. Rep., 100, 78–84 (2011).
3. 6) H. Suzuki and T. Hosaka, Yogyokyokaishi, 75, 111–119 (1967).
4. 7) T. N. Zabruskova, I. Ya. Guzman, G. S. Karetnikov and É. I. Medvedovskaya, Ogneupory, 4, 55–59 (1971).
5. 8) V. N. Antsiferov, V. G. Gilev and V. I. Karmanov, Refract. Ind. Ceram., 44, 108–114 (2003).